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Hello ! I've read you posts and if its not a big trouble, do you have a list of advance ki exercises ? I mean exercises aside from the ones we practice in our dojo like ki breathing, unbendeable arms and the aiki taisu exercises.

All of the drills that you have mentioned are excellent tools for delveoping one's ki. Let us define this type of ki so that everybody can follow. Their is a way for anyone to recondition their body/mind to move with the most effeciency/power. Aikido training is one of those ways.
We say that once a person can move in this fasion (one quick tip, keep your hands in your center, as if holding a bokken) with their mind and body as one, they now possess "good ki." There are other aspects of ki which have little obvious relation which we will not go into here.
To answer Mr. Fredeluces's question, Kokyo Doza and Push Hands (also done in Tai Chi) are probably my favorite drills for developing good ki feeling, except that you need two people. For extension try Ikkyo Undo or Funekogi Undo (I mix the two as part of my daily routine.)
Also, bokken and jo suburi (repeated steps ie. kata) help as well. They teach proper mai as well as proper body and hand positioning. Remember, the jo and bokken are extensions of YOUR HARA so always try to keep that in mind as you train. Practice with weapons will greatly improve your Aikido.
Of course you could always supplement your Aikido training with some Tai Chi. They go wonderfuly hand in hand.
Remeber developing ki is developing your body and mind together, always.

I read the thread on Ki balls, and it greatly resembled something I've been able to do for a couple years, but it has nothing to do with 'alignment of the body and mind' terribly, as some other people describe it.

Short answer: The Ki that should be used by nage (tai sabaki, hips, circles, extension, breath, ect.) and the Ki that comes from uke (momentum, force, intent, his center, ect.) are very much dependent on the proper mindstate of the nage.
The metaphiscal Ki that one might describe as the breath of the natural way of things past, present, and future, yet however still beyond time, binding all things together, and directing them toward their natural conclusion, is totally up to you to decide.

I personally don't know, but before I started, I didnt believe in the first ki either!

My advice would be to work on the first one. For the doubters, it willcome from applying your mind to the proper training. It takes time however, so in the meantime, work on your faith, and that may help you with the second.

If you have never trained with anyone who uses softness, I suggest doing so. It will impress you, to say the least.
They say training is the only way to build softness. However, I've encountered people naturally soft. Not I. Of course this is also one of those mind/body problems...